%0 Journal Article %J New Phytologist %D 2010 %T Response of phosphomonoesterase activity in the lichen Cladonia portentosa to nitrogen and phosphorus enrichment in a field manipulation experiment %A Hogan, E. J. %A Minnullina, G. %A Sheppard, L. J. %A Leith, I. D. %A Crittenden, P. D. %K abundance %K ammonium %K atmospheric nitrogen %K bogs %K cladonia portentosa %K deposition %K fertilization %K increases %K lichens %K mat-forming lichens %K n:p ratio %K nitrate %K nitrogen deposition %K phosphatase %K phosphatase-activities %K phosphorus %K translocation %K vegetation %B New Phytologist %V 186 %P 926-933 %G eng %N 4 %0 Journal Article %J Plant Ecology %D 2008 %T Long-term nitrogen deposition increases phosphorus limitation of bryophytes in an ombrotrophic bog %A Phuyal, M. %A Artz, R. R. E. %A Sheppard, L. %A Leith, I. D. %A Johnson, D. %K acid %K atmospheric nitrogen %K bog %K bryophyte %K fertilization %K grasslands %K growth %K metabolism %K mosses %K nitrogen deposition %K phosphatase %K phosphatase-activities %K soil %K sphagnum-magellanicum %K transport %B Plant Ecology %V 196 %P 111-121 %G eng %N 1 %0 Journal Article %J Atmospheric Environment %D 2006 %T Heathland vegetation as a bio-monitor for nitrogen deposition and source attribution using delta N-15 values %A Skinner, R. A. %A Ineson, P. %A Jones, H. %A Sleep, D. %A Leith, I. D. %A Sheppard, L. J. %K ammonia release %K ammonium %K atmospheric nitrogen %K bryophytes %K calluna %K calluna-vulgaris %K cladonia %K delta 15n %K grasslands %K hypnum %K impact %K inputs %K n deposition %K natural n-15 %K pollution %K sphagnum %K whim moss %B Atmospheric Environment %V 40 %P 498-507 %G eng %N 3